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Those old CDs collecting dust on your shelves or in your car could be worth a small fortune - up to $10,000, to be precise.
Many music fans have returned to buying physical media in recent years, which means CDs from older generations could be worth ...
Make a truth teller for light. Turn an old CD into a spectroscope to analyze light—you may be surprised by what you see. Try pointing your CD spectroscope at the fluorescent light in your room, sunlit ...